Writing these novels is far more than an exercise in imagination. Much research has already taken place and more will be required. While time consuming and tiring, it is well worth the effort.
As I studied these questions I was able to put Adam in differing situations. This required me to step inside the man and become him. Then it was, As Adam how do I react to the Garden? What fascinates me? How do I relate to Woman (Eve)? These questions triggered my imagination.
Now be forewarned. When researching science there is a lot of information available. And it can get boring. So you will have to dig deep and persevere. You will learn more than you will ever need to put in your story, but you may need it to understand how best to use the information.
I love history. Period! So it is not surprising that I looked to history for the answers. And I discovered an amazing fact. A sophisticated society grew up within 500 years after the Ark landed on Mt. Ararat! While 500 years sounds like a lot of time in our personal worlds, from a historical point of view it is a very brief time.
The simplicity is amazing! You actually do research while enjoying yourself. Instead of hours on the computer you see, feel, and smell the facts that may be just the nugget that fires up your imagination!